:root {
            --hb-primary: #1B4D3E;
            --hb-dark-green: #0F3A2E;
            --hb-purple: #800080;
            --hb-deep-pink: #FF1493;
            --hb-purple-light: #f3e8f3;
            --hb-pink-light: #fff0f7;
            --hb-primary-light: #e8f3ef;
            
            --text-dark: #1A1A1A;
            --text-light: #4A4A4A;
            --text-muted: #666666;
            --bg-light: #f8f9fa;
            --bg-white: #ffffff;
            --border-light: #e1e1e1;
            
            --shadow-sm: 0 5px 15px rgba(27, 77, 62, 0.08);
            --shadow-md: 0 10px 25px rgba(128, 0, 128, 0.1);
            --shadow-lg: 0 20px 40px rgba(255, 20, 147, 0.15);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Mina', sans-serif;
        }

        body {
            background-color: var(--bg-light);
            padding-top: 80px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .main-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background-color: rgba(255, 255, 255, 0.98);
            z-index: 9999;
            padding: clamp(8px, 2vw, 12px) clamp(16px, 4vw, 24px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            display: flex;
            align-items: center;
            justify-content: space-between;
            backdrop-filter: blur(10px);
        }

        #LOGO {
            width: clamp(80px, 15vw, 140px);
            height: auto;
            transition: var(--transition);
        }

        #LOGO:hover {
            transform: scale(1.05);
        }

        .profile-img {
            width: clamp(36px, 8vw, 44px);
            height: clamp(36px, 8vw, 44px);
            border-radius: 50%;
            border: 2px solid var(--hb-primary);
            object-fit: cover;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(27, 77, 62, 0.2);
        }

        .profile-img:hover {
            transform: scale(1.1);
            border-color: var(--hb-deep-pink);
            box-shadow: 0 4px 12px rgba(255, 20, 147, 0.3);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: clamp(15px, 3vw, 20px);
            width: 100%;
        }

        .page-header {
            text-align: center;
            margin-bottom: clamp(20px, 4vw, 30px);
            padding: clamp(20px, 4vw, 30px) clamp(15px, 3vw, 20px);
            background: linear-gradient(135deg, var(--bg-white), var(--bg-light));
            border-radius: clamp(20px, 5vw, 30px);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            position: relative;
            overflow: hidden;
        }

        .page-header::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(27, 77, 62, 0.03) 0%, rgba(128, 0, 128, 0.02) 50%, rgba(255, 20, 147, 0.01) 100%);
            animation: rotate 30s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .page-header h1 {
            font-size: clamp(24px, 6vw, 36px);
            font-weight: 800;
            background: linear-gradient(135deg, var(--hb-primary), var(--hb-purple), var(--hb-deep-pink));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin: 10px 0;
            position: relative;
        }

        .page-header .subtitle {
            font-size: clamp(14px, 3.5vw, 18px);
            color: var(--hb-purple);
            font-weight: 600;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .page-header .subtitle i {
            color: var(--hb-deep-pink);
        }

        .page-header hr {
            border: none;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--hb-primary), var(--hb-purple), var(--hb-deep-pink), transparent);
            width: min(200px, 60%);
            margin: 15px auto;
        }

        .button-group {
            display: flex;
            justify-content: center;
            gap: clamp(8px, 2vw, 12px);
            margin-bottom: clamp(20px, 4vw, 30px);
            flex-wrap: wrap;
            padding: 0 10px;
        }

        .small-btn {
            background: var(--bg-white);
            border: 2px solid var(--border-light);
            border-radius: 50px;
            padding: clamp(8px, 2vw, 10px) clamp(15px, 3vw, 25px);
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: clamp(13px, 2.8vw, 15px);
            font-weight: 600;
            color: var(--text-light);
            box-shadow: var(--shadow-sm);
            flex: 0 1 auto;
            min-width: 80px;
        }

        .small-btn i {
            font-size: clamp(14px, 3vw, 16px);
            color: var(--hb-primary);
        }

        .small-btn:hover {
            border-color: var(--hb-deep-pink);
            color: var(--hb-deep-pink);
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .small-btn:hover i {
            color: var(--hb-deep-pink);
        }

        .small-btn.active {
            background: linear-gradient(135deg, var(--hb-primary), var(--hb-purple));
            border-color: transparent;
            color: var(--bg-white);
        }

        .small-btn.active i {
            color: var(--bg-white);
        }

        .category-badge {
            display: inline-block;
            background: linear-gradient(135deg, var(--hb-primary-light), var(--hb-pink-light));
            color: var(--hb-primary);
            padding: clamp(6px, 1.5vw, 8px) clamp(15px, 3vw, 25px);
            border-radius: 50px;
            font-size: clamp(14px, 3vw, 18px);
            font-weight: 700;
            margin: 15px 0;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(27, 77, 62, 0.1);
        }

        .category-badge i {
            margin-right: 8px;
            color: var(--hb-deep-pink);
        }

        /* ===== ফিক্সড কোর্স গ্রিড ===== */
        .courses-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);  /* ডেস্কটপে ৩টি */
            gap: 20px;
            margin-top: 20px;
        }

        /* ট্যাবলেটে ২টি */
        @media (max-width: 992px) {
            .courses-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 15px;
            }
        }

        /* মোবাইলে ২টি */
        @media (max-width: 576px) {
            .courses-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
        }

        /* খুব ছোট মোবাইলে (400px এর নিচে) */
        @media (max-width: 400px) {
            .courses-grid {
                grid-template-columns: 1fr;
                gap: 15px;
                max-width: 300px;
                margin: 0 auto;
            }
        }

        .course-card {
            background: var(--bg-white);
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            height: 100%;
            position: relative;
        }

        .course-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--hb-primary), var(--hb-purple), var(--hb-deep-pink));
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }

        .course-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .course-card:hover::before {
            transform: scaleX(1);
        }

        .course-image {
            height: 160px;
            background: linear-gradient(135deg, var(--hb-primary), var(--hb-purple));
            position: relative;
            overflow: hidden;
        }

        .course-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .course-card:hover .course-image img {
            transform: scale(1.05);
        }

        .course-badge {
            position: absolute;
            top: 10px;
            right: 10px;
            background: linear-gradient(135deg, var(--hb-deep-pink), var(--hb-purple));
            color: white;
            padding: 4px 12px;
            border-radius: 30px;
            font-size: 11px;
            font-weight: 700;
            box-shadow: 0 2px 5px rgba(255, 20, 147, 0.3);
            z-index: 2;
        }

        .course-content {
            padding: 15px 12px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .course-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--hb-primary);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            min-height: 42px;
        }

        .course-meta {
            display: flex;
            gap: 6px;
            margin-bottom: 8px;
            font-size: 11px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .course-meta span {
            background: var(--bg-light);
            padding: 3px 8px;
            border-radius: 30px;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .course-meta i {
            color: var(--hb-deep-pink);
            font-size: 10px;
        }

        .course-price {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 8px;
            flex-wrap: wrap;
        }

        .current-price {
            font-size: 18px;
            font-weight: 800;
            color: var(--hb-deep-pink);
        }

        .original-price {
            font-size: 12px;
            color: var(--text-muted);
            text-decoration: line-through;
        }

        .discount-badge {
            background: var(--hb-purple);
            color: white;
            padding: 2px 6px;
            border-radius: 30px;
            font-size: 10px;
            font-weight: 700;
        }

        .features-mini {
            display: flex;
            gap: 4px;
            margin-bottom: 10px;
            flex-wrap: wrap;
        }

        .feature-mini {
            background: var(--hb-primary-light);
            color: var(--hb-primary);
            padding: 2px 8px;
            border-radius: 30px;
            font-size: 9px;
            font-weight: 600;
        }

        .btn-details-small {
            background: transparent;
            border: 2px solid var(--hb-primary);
            color: var(--hb-primary);
            padding: 6px;
            border-radius: 30px;
            font-size: 12px;
            font-weight: 600;
            transition: var(--transition);
            cursor: pointer;
            text-decoration: none;
            display: block;
            text-align: center;
            margin-top: auto;
        }

        .btn-details-small:hover {
            background: linear-gradient(135deg, var(--hb-primary), var(--hb-purple));
            color: white;
            border-color: transparent;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .btn-details-small i {
            font-size: 11px;
        }

        .details-container {
            background: var(--bg-white);
            border-radius: 25px;
            padding: clamp(20px, 4vw, 30px);
            box-shadow: var(--shadow-lg);
            margin-top: 20px;
            position: relative;
            overflow: hidden;
        }

        .details-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--hb-primary), var(--hb-purple), var(--hb-deep-pink));
        }

        .details-image {
            width: 100%;
            height: clamp(200px, 40vw, 300px);
            border-radius: 20px;
            overflow: hidden;
            margin-bottom: 25px;
            border: 3px solid var(--hb-primary-light);
        }

        .details-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .details-title {
            font-size: clamp(22px, 5vw, 28px);
            font-weight: 800;
            background: linear-gradient(135deg, var(--hb-primary), var(--hb-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 10px;
            line-height: 1.3;
        }

        .details-instructor {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: clamp(14px, 3vw, 16px);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .details-instructor i {
            color: var(--hb-deep-pink);
        }

        .details-price {
            background: linear-gradient(135deg, var(--hb-primary-light), var(--hb-pink-light));
            padding: clamp(15px, 3vw, 20px);
            border-radius: 15px;
            margin: 20px 0;
            display: flex;
            align-items: center;
            gap: clamp(15px, 3vw, 20px);
            flex-wrap: wrap;
            border: 1px solid rgba(27, 77, 62, 0.1);
        }

        .price-current {
            font-size: clamp(24px, 5vw, 32px);
            font-weight: 800;
            color: var(--hb-deep-pink);
        }

        .price-old {
            font-size: clamp(14px, 3vw, 18px);
            text-decoration: line-through;
            color: var(--text-muted);
        }

        .discount-tag {
            background: var(--hb-purple);
            color: white;
            padding: 5px 15px;
            border-radius: 30px;
            font-size: clamp(12px, 2.5vw, 14px);
            font-weight: 700;
        }

        .details-desc {
            margin: 20px 0;
            line-height: 1.8;
            color: var(--text-light);
            font-size: clamp(14px, 3vw, 16px);
        }

        .details-info-box {
            background: linear-gradient(135deg, var(--bg-light), var(--hb-primary-light));
            padding: clamp(15px, 3vw, 20px);
            border-radius: 15px;
            margin: 15px 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
            gap: 15px;
        }

        .details-info-box div {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: clamp(13px, 2.8vw, 14px);
            color: var(--text-light);
        }

        .details-info-box i {
            color: var(--hb-deep-pink);
            width: 20px;
            font-size: 16px;
        }

        .features-list, .curriculum-list {
            margin: 20px 0;
            padding-left: 20px;
        }

        .features-list li, .curriculum-list li {
            margin-bottom: 12px;
            font-size: clamp(13px, 2.8vw, 15px);
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .features-list i, .curriculum-list i {
            color: var(--hb-purple);
            font-size: 14px;
        }

        .btn-enroll {
            background: linear-gradient(135deg, var(--hb-primary), var(--hb-purple));
            color: white;
            border: none;
            padding: clamp(12px, 2.5vw, 15px);
            border-radius: 50px;
            font-size: clamp(16px, 3.5vw, 18px);
            font-weight: 700;
            width: 100%;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 25px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .btn-enroll:hover {
            background: linear-gradient(135deg, var(--hb-purple), var(--hb-deep-pink));
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }

        .btn-enroll:active {
            transform: translateY(-1px);
        }

        .btn-back {
            background: transparent;
            border: 2px solid var(--hb-primary);
            color: var(--hb-primary);
            padding: clamp(8px, 1.5vw, 10px) clamp(15px, 3vw, 20px);
            border-radius: 50px;
            font-size: clamp(13px, 2.8vw, 14px);
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 20px;
            transition: var(--transition);
        }

        .btn-back:hover {
            background: linear-gradient(135deg, var(--hb-primary), var(--hb-purple));
            color: white;
            border-color: transparent;
            transform: translateX(-5px);
            box-shadow: var(--shadow-md);
        }

        .btn-back i {
            font-size: clamp(12px, 2.5vw, 13px);
        }

        .login-alert {
            background: linear-gradient(135deg, #fff3cd, #fff9e6);
            border: 1px solid #ffeeba;
            color: #856404;
            padding: clamp(12px, 2.5vw, 15px) clamp(15px, 3vw, 20px);
            border-radius: 15px;
            margin-bottom: 20px;
            display: flex;
            align-items: flex-start;
            gap: 15px;
            font-size: clamp(13px, 2.8vw, 14px);
        }

        .login-alert i {
            font-size: clamp(20px, 4vw, 24px);
            color: var(--hb-purple);
            flex-shrink: 0;
        }

        .login-alert a {
            color: var(--hb-deep-pink);
            font-weight: 700;
            text-decoration: none;
        }

        .login-alert a:hover {
            text-decoration: underline;
        }

        .no-courses-message {
            text-align: center;
            padding: 50px 20px;
            background: var(--bg-white);
            border-radius: 20px;
            box-shadow: var(--shadow-sm);
            width: 100%;
            grid-column: span 3;
        }

        @media (max-width: 992px) {
            .no-courses-message {
                grid-column: span 2;
            }
        }

        @media (max-width: 576px) {
            .no-courses-message {
                grid-column: span 2;
            }
        }

        @media (max-width: 400px) {
            .no-courses-message {
                grid-column: span 1;
            }
        }

        .no-courses-message i {
            font-size: 48px;
            color: var(--hb-primary);
            margin-bottom: 15px;
        }

        .no-courses-message h4 {
            font-size: 20px;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .no-courses-message p {
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        @media (max-width: 768px) {
            body {
                padding-top: 70px;
            }

            .button-group {
                gap: 6px;
            }

            .small-btn {
                padding: 8px 15px;
                font-size: 13px;
                min-width: 70px;
            }
        }

        @media (max-width: 480px) {
            body {
                padding-top: 60px;
            }

            .button-group {
                flex-direction: row;
                overflow-x: auto;
                padding: 5px 0;
                justify-content: flex-start;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: none;
                flex-wrap: nowrap;
            }

            .button-group::-webkit-scrollbar {
                display: none;
            }

            .small-btn {
                flex: 0 0 auto;
                padding: 6px 12px;
                font-size: 12px;
                min-width: 60px;
            }

            .details-price {
                flex-direction: column;
                align-items: flex-start;
            }

            .login-alert {
                flex-direction: column;
                text-align: center;
            }

            .login-alert i {
                margin: 0 auto;
            }
        }

        @media (max-height: 600px) and (orientation: landscape) {
            .details-image {
                height: 150px;
            }
        }

        @media (hover: none) {
            .course-card:hover,
            .small-btn:hover,
            .btn-details-small:hover,
            .btn-enroll:hover,
            .btn-back:hover {
                transform: none;
            }
        }

        .fa-spinner {
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }